-Fixed Json macro bug
    https://github.com/dionjwa/nodejs-std/issues/10

    -Move Node.parse->Node.json.parse (also stringify).
    https://github.com/dionjwa/nodejs-std/issues/4

   - renamed 'childProcess' to 'child_process' for consistency with the other node modules.

    Added unit tests for the above issues.
Fix travis config.